Two-cycle gas engine



Oct. 11, 1932. T, HOLLOWAY 1,881,582

TWO-CYCLE GAS ENGINE Filed y 1950 2 Sheets-Sheet l Oct. 11, 1932. M HOLLOWAY 1,881,582

TWO-CYCLE GAS ENGINE Filed May 7, 1930 2 Sheets-Sheet 2 Patented Oct 11 1932 I v UNITED TATES PATENT OFFICE MACK T. HOLLOWAY, OEGEAYMONT, GEORGIA TWO-GYCLE GAS ENGINE Application filed May 7, 1930. Serial No. 450,472.

This invention relates to that type of two- The operation of an engine thus constructcylinder two-cycle engine in which a pump ed will be obvious from a study of the three is arranged to supply directly to the cyldiagrams. Each downward stroke of the inders the charges of explosive mixture for pump piston draws in a charge of carbureted '5v scavenging and power, and the object of the air through valve 23, and each up-stroke of 59 present invention is to simplify the constructhe piston forces the charge thus drawn in tion in such manner as to do away with all into one or the other of the power cylinders valves between the pump and the power cylwithout compressing the charge. In Figure inders, as more fully hereafter set forth. 2, the piston in power cylinder is compress- In the drawings annexed: ing and its piston has closed port 17 as well as 55 Figure 1 is a view partially in plan and port 16; the pump piston is drawing a charge in horizontal sect-ion, and into its cylinder through the carbureter, the Figures 2, 8 and 4; are schematic views port 17 at the other side being closed by the showing the pistons in various positions. other power piston, this latter piston being Referring to the drawings by reference in the act of making a working stroke. At 0 characters, 5 designates one of the power about the time the right hand power piston cylinders and 6 the other power eylmder, descends far enough to uncover the ports 16, and 7 designates the pump cylinder. The 17, the pump piston will have started upusual power pistons 8 work in the power cylwardly to thus perform the scavenging operinders and are connected to the main or crank ation for power cylinder 6 and follow in the shaft 9 by the usual piston rods 10. A solid usual manner by charging the same, preparapiston 11 works in the pump cylinder and tory to the upward, compression stroke of the is connected by a rod 12 to a crank on the power piston in said power cylinder 6. Keeppump shaft 13, this shaft 13 being geared mg in mind that the pump piston makes two 25 to the crank shaft, by gears 14E and 15 t a strokes for each revolution of the crank two-to-one ratio, so that with each revolution shaft, it will be observed that the foregoing of the crank shaft, the pump piston will cycle of operations is carried out in each receive two reciprocations. power cylinder. With my arrangement, it Th cylinders 5 and 6 are ovid d ith the will be seen that I not only do away with the 30 usual exhaust ports 16 and the usual inlet necessity of using the crank casing as a comports 17, these portsin each cylinder being presslon chamber, but also ClO away With all arranged as usual opposite each other and valves between the pump cylinder and the about mid-length of the cylinder. Each of power cylinders. And it will be further the inlet ports 17 is connected by a conduit noted that I do not use the pump for com- 35 18 with a port 19 in the top of the pump cyl pression purposes.

inder, ata point beyond the extreme top Iclann: stroke of the pump piston, so that the ports n engine of the type set forth embodying 19 will always be in communication with the a pair of two-cycle power cylinders having ports 17. Each power cylinder is provided their pistons connected to a crank shaft and 40 with the usual spark plug 20, and the inlet each being provided with a spark plug and port 21 in the top wall of the pump cylinalso with an inlet port and an outlet port, a der is connected to a carbureter 22 of any pump cylinder having two exhaust ports in usual construction, this carbureter being proon ant connection respectively to the inlet vided with a check valve 23, which is adaptports of said power cylinders, this pump cyl- 45 ed to open inwardly. inder being provided with an inlet for the 2 I p 1,ss1,582

charge mixture, this inlet being provided with a valve adapted to open only on the suetion stroke, a piston working in said pump cylinder; and means connecting said piston with the aforesaid crank shaft adapted to impart to the'pump piston two reciprocations for each revolution of the crank shaft, the ports being so positioned and the movement of the pistons being so timed that on each sucm tion stroke of the pump piston the power pistons will close their companion inlet ports and on eaohlexpelling stroke of {the pump piston one Or t e ot er sa' n e parts wil be opened and the other closed sothat on each 7 135 propelling stroke one or the other power cyl.

, i nder will be successively'--scas engetl and charged without compressing the chgtrp, re, V

In testimony whereof I hereunto affix my I signature.

, -20 MACK TQVVHOLLOWAY. 

